{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{4}{c}}
\toprule
            &\multicolumn{1}{c}{\shortstack{Cand. wins,\\t+1}}&\multicolumn{1}{c}{\shortstack{Cand. vote\\share, t+1}}&\multicolumn{1}{c}{\shortstack{Cand. qualif.,\\t+1}}&\multicolumn{1}{c}{\shortstack{Orient. nb. other \\cand.,t+1}}\\\cmidrule(lr){2-2}\cmidrule(lr){3-3}\cmidrule(lr){4-4}\cmidrule(lr){5-5}
            &\multicolumn{1}{c}{(1)}         &\multicolumn{1}{c}{(2)}         &\multicolumn{1}{c}{(3)}         &\multicolumn{1}{c}{(4)}         \\
\midrule
Upper bound &       0.041\sym{**} &       0.050\sym{***}&       0.168\sym{***}&       0.148         \\
            &     (0.019)         &     (0.012)         &     (0.047)         &     (0.129)         \\
\addlinespace
Lower bound &       0.019         &       0.018\sym{***}&       0.087\sym{**} &      -0.016         \\
            &     (0.020)         &     (0.006)         &     (0.034)         &     (0.089)         \\
\midrule
Bootstrap replications&          10         &          10         &          10         &          10         \\
Mean, left of threshold&       0.070         &       0.151         &       0.295         &       1.287         \\
\bottomrule
\end{tabular}
}
